A Butterfly Spread Is the Cheapest Way to Be Precisely Right

Pull up the option chain on a hypothetical stock trading near $100, pick one expiration, and read three call prices off it: the 95 at $7.00, the 100 at $4.00, the 105 at $2.00. Buy one 95, sell two 100s, buy one 105. That’s a long call butterfly. It lets you say “this stock will be close to $100 on that date” for a $100 debit, and when a view really is that specific, few structures on the chain pay as much for as little, since the premium from the two calls you sell covers nearly all of the two you buy and the payoff at the center is several times the cost. The catch is in the word “precisely.”

What the trade costs

You buy the outer calls. You sell the middle pair.

That $100 is the entire risk. Every short call is covered by a long one, so no margin call waits behind it.

What it pays at expiration

At expiration, only calls in the money have value. At exactly $100, that’s the 95 alone.

Four dollars of profit for every dollar put in, at the center. Move away from $100 and the payoff slopes down. Each dollar the stock moves, in either direction, costs $100 of profit per spread until the stock reaches the break-evens, and beyond them the loss keeps growing until it hits the $100 debit at the outer strikes and stops there for good.

Here’s the full shape, per spread, at expiration:

Stock at expiration	Spread value	Profit or loss
$95 or lower	$0	-$100
$96	$100	$0
$98	$300	+$200
$100	$500	+$400
$102	$300	+$200
$104	$100	$0
$105 or higher	$0	-$100

Outside $95 to $105, you lose the debit. Nothing more.

Against the alternatives

Compare the same view expressed with fewer legs. A 95/100 bull call spread costs 7.00 - 4.00 = $3.00. It pays at most $5.00, so $2.00 of profit on $3.00 risked. It needs only a close at $100 or above, a looser bet. The 100 call alone costs $4.00 and expires worthless at exactly $100.

So the butterfly wins on one measure. If you’re right about the price, it pays the most per dollar risked, by a wide margin. If you’re wrong, it costs the least.

The wing width is the dial. Put the outer strikes $10 from the center and the profit zone widens, the debit rises, and the payoff at the center usually falls well short of 4 to 1. Narrower wings do the reverse. The center strike should be the price you actually expect. Naming that honestly is harder than it sounds.

What the low price hides

Four contracts across three strikes mean four sets of bid-ask spreads on the way in and, if you close before expiration, four more on the way out. On a spread whose debit is only $1.00, giving up a few cents on each leg can take a real bite, so the quoted mid-price is often a price you won’t get. Enter with a limit order on the whole spread.

Timing is the second cost, and the less obvious one. Before expiration, the two short 100 calls still hold time value. It works against you for most of the trade’s life. With a few weeks left and the stock sitting right on $100, the butterfly may be worth only a little more than the debit paid, and most of the $400 appears in the last days before expiration, as the short calls’ time value finally drains. The payoff table describes the final day. Earlier days pay far less.

There’s an honest objection here: a trade whose profit only appears at the last minute rewards holding to expiration, which is exactly when a small move costs the most. That’s true. The answer is that the butterfly was never a trade for a vague view. If you can’t name a price and a date, a looser structure fits better, and the course on trades after the covered call walks through several of them, including the diagonal spread.

Where the defined risk leaks

The two short 100 calls can be assigned early once they’re in the money. It’s most likely just before an ex-dividend date, when the holder of a call can capture the dividend by exercising, and does so if the call’s remaining time value is smaller than the dividend. Assignment leaves you short 200 shares against long calls that still cover the risk. The position stays hedged. Managing it is messier, though, and costs fees. You can exercise a long call to cover shares or close what’s left of the spread along with the short stock, and either route turns a tidy expiration into a few extra trades.

Be precise or pick something else

A butterfly is the cheapest way to express an exact price target on a known date, and the arithmetic says it pays up to 4 to 1 for being right with a loss capped at the debit. It fits only when you have that precision and can hold close to expiration. Unlike the ratio spread, which looks just as cheap, every short leg here is covered. More structures sit in the options hub.